1564216220 has 36 divisors (see below), whose sum is σ = 3821159160. Its totient is φ = 536302368.

The previous prime is 1564216219. The next prime is 1564216253. The reversal of 1564216220 is 226124651.

It is a super-2 number, since 2×1564216220² = 4893544765822176800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 797090 + ... + 799049.

It is an arithmetic number, because the mean of its divisors is an integer number (106143310).

Almost surely, 2^1564216220 is an apocalyptic number.

1564216220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1564216220 is an abundant number, since it is smaller than the sum of its proper divisors (2256942940).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1564216220 is a wasteful number, since it uses less digits than its factorization.

1564216220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1596162 (or 1596153 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 1564216220 is about 39550.1734509471. The cubic root of 1564216220 is about 1160.8219056194.

The spelling of 1564216220 in words is "one billion, five hundred sixty-four million, two hundred sixteen thousand, two hundred twenty".